fix(release): restore literal em-dash in package.json description (prettier)

The 0.0.46 version bump escaped the em-dash to \u2014, failing the
format:check CI step. Prettier normalizes it back to the literal —.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

packages/mosaic/package.json

@@ -6,7 +6,7 @@
     "url": "https://git.mosaicstack.dev/mosaicstack/stack.git",
     "directory": "packages/mosaic"
   },
-  "description": "Mosaic agent framework \u2014 installation wizard and meta package",
+  "description": "Mosaic agent framework — installation wizard and meta package",
   "type": "module",
   "main": "dist/index.js",
   "types": "dist/index.d.ts",